Overview Product Description Ar-15 11.5in 5.56 M4 Barrel Group 1-7 Carbine GasCartridge : AKK_5.56 x 45Contour : GovernmentFinish : BlackGas System Length : CarbineLength : 11.5''Make : AR-15Make/Model : AR-15Muzzle Threads : 1/2-28Twist : 1-7 Product Videos Custom Field Product Reviews